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Effect of wind pressure and modulation schemes on rain interrupted optical wireless links under tropical climates

机译：风压和调制方案对热带气候下雨中断的光无线链路的影响

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摘要

Tropical and subtropical regions experience heavy rain intensities often accompanied with medium to strong winds. In this work, the effect of perpendicular wind flow and various modulation formats on a rain interrupted optical wireless link is investigated experimentally under controlled laboratory conditions. Attenuation as a function of rain rate is observed at different wind pressure. It is found that rain induced scattering dominates the rain specific attenuation however significant attenuation is expected at much higher wind pressure which normally increases with altitudes. A comparative performance of modulation formats like direct intensity modulation (D-IM), pulse width modulation (PWM) and various subcarrier intensity modulated (SIM) signals under heavy rain conditions is reported. It is found that SIM-FSK and SIM-AM offer better signal to noise performance (approximately two times) followed by subcarrier phase (SIM-PM) and frequency (SIM-FM) respectively. Also, SIM-FSK and PWM are least attenuated in heavy precipitation.
机译：热带和亚热带地区的降雨强度很高，通常伴有中等至强风。在这项工作中，在受控的实验室条件下，通过实验研究了垂直风流和各种调制格式对降雨中断的光学无线链路的影响。在不同的风压下，衰减率是降雨率的函数。已经发现，雨引起的散射在雨的比衰减中占主导地位，然而，在高得多的风压（通常随海拔升高而增加）下，预计会有明显的衰减。据报道，在大雨条件下，诸如直接强度调制（D-IM），脉冲宽度调制（PWM）和各种子载波强度调制（SIM）信号等调制格式的比较性能。发现SIM-FSK和SIM-AM具有更好的信噪比性能（大约两倍），其次分别是子载波相位（SIM-PM）和频率（SIM-FM）。同样，SIM-FSK和PWM在强降水中衰减最小。

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